Double-reduction gear



K. BAUMANN DOUBLE REDUCTION GEAR May 31,1927. 1,630,599

Filed Jul-J16 1923 Kar] .Bdumanzz WITNESSES- INVENTOR ATTORNEY d May 31 i927,

nnrrso STATES PATENT OFFICE;

KARL eamvmnn, or URMSTON, ENGLAND, risers-non, BY MESNE ASSIGNMENTS, To

"\FJ'ESTINGIifGUSE AND DYNAMUMETER COMPANY; 11 CORPORATION OF PENIL;

EYLVANIA,

DOUBLE REDUCTION GEAR.

Application filed July 18, 1928, Serial Ho. 651378, and in Great Britain Ju1y'25, 1922 This intention relates to double reduction now Well-known floating frame ction gear of this type it ry to mount the shafts of l '"rmediate gear memi n frames supported e gear (fitzie in ch a manner as to limited tilti' n'iovement of one i to anot er and of any one or of such shafts relative to the shaft the low speed gun members. construction in order to obtain e of etliciency under all conis of operation a coplanar disposition of the ares l the shafts is necessary and the main ad antage derived therefrom that the gears are not thrown out of align-- ment hy an' distortion of the gear case which may arise, as for instance in the case of a marine installation from distortion or tw' ting of the ship about a longitudinal axis.

The object of the present invention to priirvide a simplified and less costly arrange-- ment of reduction gear of the aforesaid type which will possess the main advantage of the con truction set forth above and whichwlll enable a high degree of efficiency to be obtained under all conditions of operation Without necessitating a coplanar disposition of the axes of all the shafts. To this end the invention consists inmounting a high speed gear shaft and its associated intermediate shaft so that they can tilt relatively to the low speed shaft but are incapable of tilting; movement relative to one another as for instance by mounting both shafts in a single lloating frame. By this means twistingot the rear case will affect neither the content of the large gear wheel and the intermediate pinion nor the engagement of the intermediate gear Wheel with the high speed pinion in order that the invention may he more clearly nndcrstood and readily carried into practice reference will now be .made to the accompnnying drawings in which Fig. l is a "rap-memory view, in transverse sectiona elevation, of one form of structure for sup porting the intermediate and high speed shafts of a doi'ihle reduction gear (ZOHSl'IUClJ- id in accordance with my invention, and Fig. is a similar view of another form of structure for supportin;- the intern'lediate fin donbl r rcdn has hcon custon r the high speed an l i and high speed shafts of a donble reduction gear. i

in each form illustrated the reduction giar comprises a high soeed shaft 8 carrymg a 'lllrlt' reduction pnnon which engages hrst reduction gear Wheel 5 fasten an intermediate shaft 6 which also carries a sec- *ir case to relative to the intermediate shaft 6.

l v arrangement it will. be apparent that as the shafts 3 and 6 are mounted 011 a common floating frame 10 they can tilt relative to the shaft (that are incapable of tilting movement relative to one another. Consequently any twisting or distortion to which the gear case 131M113 be subjected when in service will be compensated by tilting IHOYGllilBHtS of the shafts 3 and 6 relative to the shaft 9. It will also be apparent tl at as the shafts 3 and 6 are incapable of tilting movement relative to one another the position of the shaft 3 relative to the plane containing the axes of theshafts 6 and 9 is immaterial. shaft is located with its axis in the plane containing the axes of the shafts 6 and 9 While in Fig. 2 it is located a considerable distance away from such plane.

it will of course be understood that the inventioi'i is not limited to any particular method of obtaining the tilting or floating movement of the frames 10 or to any par ticular constructiini or arrzmgement of the gear as; a whole or of any part thereof other than such as is defined in the succeeding statement of claims.

Having 110W particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that What I claim is 2- l. in a double reduction gearing embody ing a c high speed shaft, an intermediate speed shaft and a low speed shaft, a rigid frame member carrying two of said shafts so as to nnrintain them in parallel relation ship, and mounting means for said frame member comprising a section of I-beam having the plane of its Web substantially normal in Fig. l for instance this i to the axis of third shaihfwherehy said frame may tilt with respect to said third shaft by fiexure of said Web.

2. In a double reduction gearing e1nhodying a high speed shaft, an intermediatespeed speed shaft and a low speed shaft, a rigid frame member carrying saidhinh and intermediate shafts sons to maintain theni in parallel relationship, and mounting means i'or said frame member comprising a section of I-heain having: the plane of its web substantially normal to the axis oi the third shaft, whereby eaid frame may tile with respect to said thirdshaithy iexnre of said Web. r

:L." In a' double reduction gear, the combination of driving, intermediate and driven gear members, a rigid casing for supporting the driven gear member, a rigid bearing struccure for carrying the intermediate and driving' gear Inemhers, and means for flexibly supporting said hearing, strncinre upon the casin i i In a double reduction gear, (he combination of high, intermediate and low speed shafts; a rigid casing i'or supporting the low speed eha'lt, a rigid structure for carrying the intermediate and high speed shafts, and means for flexibly supporting said structure upon the casino.

6. In a double reduction gear, the combine illbll of a high speed shaft, aninterrnediate speed shaft, a low speed shaft, a rigid casing for HHPPQHSIHQJ the low speed shalt, a eliigle structure for carrying; the intermediate and high speed shaftsr and mounting meanwhh mipporting said elarnctnre upon the mixing,

said mourning means comprising a lion oi I-heani having the plane of its weh enhetantially normal to the axis of the lowepeecl shaft, whereby eaid structure may hill; with reepeet i'o l'helo'w speed shaft by flexure of the weh.

7. 111 :1 double reduction gear, the comhination of high, internimliate and low speed iillfiilifi, a rigid casing; for euppori'ing one of the eh'rqltearigid structure for cairyin he olher two shafts and means iorflexihiy enp liOl'lllilfj eaid structure upon the casing.

in testimony wl lereol, I have hereunto enhmirrihed my name this 25th day of June, 1923.

KARL BAUMANNQ 

